postscribe
/ˌpəʊs(t)ˈskrʌɪb/Now rare
verb
[with object] To write (something) afterwards, to add (something further) in writing; to write as a postscript or appendix.
Origin
Early 17th century; earliest use found in Thomas Adams (1583–1652), Church of England clergyman. From classical Latin postscrībere to write after, add in writing (Tacitus) from post- + scrībere to write.